Evan Vienneau, Addy J. Evans, Odelia V. Hartl, Nassim Bozorgnia, Louis E. Strigari, Alexander H. Riley and Nora Shipp
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引用次数: 0
摘要
我们研究了 "极光 "宇宙学模拟中人马座矮球状星系类似物湮灭产生的伽马射线信号。对于速度相关的湮灭截面,我们计算了模拟的人马座矮球星系和银河系前景的发射。除了束缚在斯格瑞星上的 DM 粒子的湮灭信号之外,我们还首次考虑了束缚在与斯格瑞星空间重叠的银河系上的 DM 粒子的湮灭信号。对 p 波模型来说,这种贡献可以使信号增强一个数量级以上,而对 d 波模型来说,这种增强可以超过三个数量级。对于 Sommerfeld 和 s 波模型,相应的发射没有明显变化。对于 Sommerfeld 模型,可以在 MW 前景发射之上看到 Sgr 源,而对于 s 波、p 波和 d 波模型,Sgr 的信号很可能被 MW 前景发射所主导。我们在观测到的斯格瑞伽马射线发射的背景下解释了我们的结果。我们发现,考虑到该区域估计的背景发射,模拟的模板可能具有过于扩展的空间形态,无法解释观测到的点状发射。
Significant impact of Galactic dark matter particles on annihilation signals from Sagittarius analogues
We examine the gamma-ray signal from dark matter (DM) annihilation from analogues of the Sagittarius (Sgr) dwarf spheroidal galaxy in the Auriga cosmological simulations. For velocity-dependent annihilation cross sections, we compute emissions from simulated Sgr subhalos and from the Milky Way (MW) foreground. In addition to the annihilation signals from DM particles bound to Sgr, we consider for the first time the annihilation of DM particles bound to the MW that overlap spatially with Sgr. For p-wave models this contribution can enhance the signal by over an order of magnitude, while for d-wave models the enhancement can be over three orders of magnitude. For Sommerfeld and s-wave models, the corresponding emission does not significantly change. For the Sommerfeld model, the Sgr source can be visible above the MW foreground emission, while for s, p and d-wave models, the signal towards Sgr is most likely dominated by foreground MW emission. We interpret our results within the context of the observed gamma-ray emission from Sgr. We find that, given the background emission estimated from this region, the templates from simulations likely have spatial morphology that is too extended to explain the point-like emission that is observed.
期刊介绍:
Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.